Decode with mem limit #183

Job	Run time
set-image	1s
tests	2m 11s
fmt	1m 24s
checks	1m 45s
bench-rust-nightly (bit-vec)	17m 27s
clippy	1m 11s
bench-rust-nightly (bytes)	16m 18s
miri (bit-vec)	5h 35m 21s
bench-rust-nightly (generic-array)	16m 21s
miri (bytes)	2m 59s
bench-rust-nightly (derive)	16m 8s
miri (generic-array)	2m 51s
bench-rust-nightly (max-encoded-len)	16m 8s
miri (arbitrary)	2m 52s
build-linux-ubuntu-amd64	1m 20s
publish-dry-run	1m 9s
	7h 15m 26s

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